Olive-tree root dynamics under different soil water regimenes
1992
Fernández Luque, José Enrique | Moreno Lucas, Félix | Martín Aranda, José | Fereres Castiel, Elías
11 pages, 5 figures, 3 photographs, 1 table,26 references.
Show more [+] Less [-]Tree roals develop in response to environmental conditions in the soil. The dynamics of Aevelopment of olive-tree root systems (Olea europaea L., ev. Manzanillo) in response to soil water conclítions were studied under three different soil water regimes in a 20-year old grave near Seville (Spain). Minirhizotrons clown to 1 m were used to characterize changes in rooting density under rainfed, flood and localized (d rip) irrigation. The results showed a clase association between root growth and soil water status throughout the season. Root growth was observed far away from the tree trunk in the rainfed trealment but it was concentrated only in the wetted zone in the case oF drip irrigation. Root growth under F100d irrigation was more uniform over the whole area occupied by one tree. Root growth periods in the rainfed treatment occured when the soil water content was high, and was very limited during the summer (rainless period). In the irrigation treatments, the maximum root growth was observed during the irrigation period (summer). Root appearance changed from paJe to a dark brown colour in about one month after il was firsl observed in the rainfed treatment. However, il took two to three months before ¡he same change in aspect was observed in the irrigated treatments.
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